package cn.yj.netty.utils;

/**
 * @author 永健
 * @since 2022-02-15 11:41
 */
public class StrUncodeUtils {
    /**
     * 字符串转换成为16进制(无需Unicode编码)
     *
     * @param str
     */

    public static String str2HexStr(String str) {

        char[] chars = "0123456789ABCDEF".toCharArray();

        StringBuilder sb = new StringBuilder("");

        byte[] bs = str.getBytes();

        int bit;

        for (int i = 0; i < bs.length; i++) {

            bit = (bs[i] & 0x0f0) >> 4;

            sb.append(chars[bit]);

            bit = bs[i] & 0x0f;

            sb.append(chars[bit]);

            // sb.append(' ');

        }

        return sb.toString().trim();

    }

    /**
     * 16进制直接转换成为字符串(无需Unicode解码)
     *
     * @param hexStr
     */

    public static String hexStr2Str(String hexStr) {

        String str = "0123456789ABCDEF";

        char[] hexs = hexStr.toCharArray();

        byte[] bytes = new byte[hexStr.length() / 2];

        int n;

        for (int i = 0; i < bytes.length; i++) {

            n = str.indexOf(hexs[2 * i]) * 16;

            n += str.indexOf(hexs[2 * i + 1]);

            bytes[i] = (byte) (n & 0xff);

        }
        return new String(bytes);
    }

    public static void main(String[] args) {
        String a ="你好，hello word";
        String hex = str2HexStr(a);
        System.out.println(hex);
        System.out.println(hexStr2Str(hex));
    }
}
